Question

Explain the type of voids found in three-dimensional close packing in crystals.

Answer 1

Two voids

Tetrahedral void	Octahedral void
Voids are surrounded by four spheres	Voids are surrounded by six spheres
The sphere of the second layer is placed above the void of the first layer	The voids of the second layer comes above the voids of first layer.
No. of tetrahedral void 2N	No. of octahedral void N